- Computational Physics, Inc
 - Fairfax - Forensic Document Services International, Inc.
- Providing forensic examination of questioned documents.
- A. Zhukov, Ph.D. & Associates
- Rockville - Vehicle accident reconstruction and engineering consulting services.
- Bode Technology Group
- Springfield - Core businesses include forensic DNA casework, DNA analysis of convicted offender samples, and DNA identification research and development.
- Vargis
- Herndon - Off-the-shelf digital aerial image (orthophoto) maps and geographic data acquisition and management services. online catalogue, sample images.
- Scientific Consulting Services
- Alexandria - Chemistry software and products for Windows.
- GeoLas Consulting
- Alexandria - Technology consulting for Airborne Laser Mapping, Imaging Laser Altimetry, and visualisation services for topographic 3D data.
- Thomson Instrument Company
- Chantilly - Distributors of hplc pumps, detectors, software, fittings, and accessories.
- Technical Resources International, Inc.
- Rockville - Team of science, health, and environmental professionals offer services in research, documentation, training, conference planning, and more.
- Elohi Geophysics, Inc.
- Fairfax - Geophysics for near-surface, geotechnical, and environmental characterization. surface and downhole swept frequency seismic sources. reflection, refraction, and borehole surveys.
- Howald Systems
- Bethesda - Offers GIS consulting and sales of MrSID image compression software.
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